Toyota 42431-06020 Rear Disc

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Loosen the wheel lug nuts, raise the vehicle, and support it securely on jackstands. Remove the wheel and install the lug nuts to hold the disc in place, releasing the parking brake if working on the rear brake disc. Remove the brake caliper without disconnecting the brake hose, suspending it out of the way with a piece of wire to avoid hanging it by the flexible brake hose. Detach the torque plate by removing the mounting bolts. Visually inspect the disc surface for score marks and damage; light scratches are normal, but deep scoring over 0.039-inch requires disc removal and refinishing. Check for disc runout using a dial indicator placed about 1/2-inch from the outer edge, ensuring the reading does not exceed the allowable limit. It is recommended to resurface the discs whenever the pads are replaced to ensure a smooth finish and eliminate brake pedal pulsation. The disc must not be machined below the specified minimum allowable refinish thickness, which can be checked with a micrometer. Remove the lug nuts holding the disc in place and slide the disc off the hub, addressing any interference from the parking brake shoes if necessary by adjusting the shoes. Place the new disc over the threaded studs, install the torque plate and caliper, tightening the bolts to the specified torque. Finally, install the wheel and lug nuts, lower the vehicle, tighten the lug nuts, and depress the brake pedal a few times to ensure proper contact before driving.

If the rear disc is stuck, you should rotate the adjuster to back the parking brake shoes away from the drum surface.